Transport Current in MgB2 based Superconducting Strand at 4.2 K and Self-Field

Details Transport Current in MgB2 based Superconducting Strand at 4.2 K and Self-Field Transport Current in MgB2 based Superconducting Strand at 4.2 K and Self-Field

2001-02-23

arxiv.org/abs/cond-mat/0102441v2

Physics

Condensed Matter

Superconductivity

7 pages, 1 Fig. 2 tables, minor editiorial revision

Scientific paper

Transport current values of 7.5 x 104 A/cm2 at 4.2 K and self-field are reported for MbB2-based tapes. MgB2 strands were formed by directly filling commercially available MgB2 powder into Nb-lined, monel tubes and wire drawing. The wires were then rolled into tapes 2.56 x 0.32 mm2, with a total superconducting cross section of 0.2319 mm2. Transport measurements were performed using a standard four-point technique at T = 4.2 K (in liquid helium) and at self field. Three samples were prepared, with heat treatments of 900C for 1, 2, and 3 h under 1/3 at Ar. Measured values of transport current were 4.7, 7.5, and 1.1 x 104 A/cm2, respectively, at 4.2 K and self field. M-H loops taken on the sample HT for 1 h showed magnetic Jcs of 4.2 x 104 A/cm2 at 4.2 K and 1 T, indicating that the material had reasonably well connected grains.

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